Comtech EF Data CDM-625 - Manual (Page 83)

CDM-625 Advanced Satellite Modem Revision 15
Rear Panel Connectors and Pinouts MN-CDM625
3–13
3.2.3.2 Alarms (DB-15M)
Unit alarms are provided on this 15-pin Type ‘D’ male connector.
Table 3-12. Alarm Interface Connector Pinouts
Pin #
(L-R)
Name Signal Function
1 GND Ground
9 EXT-OFF EXT Carrier OFF
2 AGC AGC Voltage (Rx signal level, 0 to 10 Volts)
10 N/A Spare (No connection)
3 RX-Q Rx Q Channel (Constellation Monitor)
11 RX-I RX I Channel (Constellation Monitor)
4 UNIT-COM Unit Fault
12 UNIT-NO Unit Fault (Energized, No Fault)
5 UNIT-NC Unit Fault (De-energized, No Fault)
13 TX-COM Tx Traffic
6 TX-NO Tx Traffic (Energized, No Fault)
14 TX-NC Tx Traffic (De-energized, No Fault)
7 RX-COM Rx Traffic
15 RX-NO Rx Traffic (Energized, No Fault)
8 RX-NC Rx Traffic (De-energized, No Fault)
3.2.3.3 PMSI Connector, DB-9F
The PMSI (Pre-Mapped Symbol interface) is a 9-pin Type ‘D’ female
connector. The PMSI is an EIA-485 multidrop bus system, used in tandem
with Carrier-in-Carrier (CnC), where one device transmits, and all other
devices on the multidrop bus are configured to receive.
Table 3-13. PMSI (Pre-Mapped Symbol Interface) Connector Pinouts
Pin #
(R-L) Description
Direction
1 Ground –
6 Spare (No connection) –
2 Spare (No connection) –
7 PMSI symbol clock – RS485 - In/Out
3 PMSI symbol clock – RS485 + In/Out
8 PMSI LSB – RS485 - In/Out
4 PMSI LSB – RS485 + In/Out
9 PMSI MSB – RS485 - In/Out
5 PMSI MSB – RS485 + In/Out